mirror of
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70 lines
2.9 KiB
C++
70 lines
2.9 KiB
C++
/* Python-rgbcx Texture Compression Library
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Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstdint>
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static inline uint32_t iabs(int32_t i) { return (i < 0) ? static_cast<uint32_t>(-i) : static_cast<uint32_t>(i); }
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static inline uint64_t iabs(int64_t i) { return (i < 0) ? static_cast<uint64_t>(-i) : static_cast<uint64_t>(i); }
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static inline uint8_t scale8To5(uint32_t v) {
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v = v * 31 + 128;
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return (uint8_t)((v + (v >> 8)) >> 8);
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}
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static inline uint8_t scale8To6(uint32_t v) {
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v = v * 63 + 128;
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return (uint8_t)((v + (v >> 8)) >> 8);
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}
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static inline int scale5To8(int v) { return (v << 3) | (v >> 2); }
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static inline int scale6To8(int v) { return (v << 2) | (v >> 4); }
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template <typename S> inline S maximum(S a, S b) { return (a > b) ? a : b; }
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template <typename S> inline S maximum(S a, S b, S c) { return maximum(maximum(a, b), c); }
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template <typename S> inline S maximum(S a, S b, S c, S d) { return maximum(maximum(maximum(a, b), c), d); }
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template <typename S> inline S minimum(S a, S b) { return (a < b) ? a : b; }
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template <typename S> inline S minimum(S a, S b, S c) { return minimum(minimum(a, b), c); }
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template <typename S> inline S minimum(S a, S b, S c, S d) { return minimum(minimum(minimum(a, b), c), d); }
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template <typename T> inline T square(T a) { return a * a; }
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static inline float clampf(float value, float low, float high) {
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if (value < low)
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value = low;
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else if (value > high)
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value = high;
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return value;
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}
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static inline uint8_t clamp255(int32_t i) { return (uint8_t)((i & 0xFFFFFF00U) ? (~(i >> 31)) : i); }
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template <typename S> inline S clamp(S value, S low, S high) { return (value < low) ? low : ((value > high) ? high : value); }
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static inline int32_t clampi(int32_t value, int32_t low, int32_t high) {
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if (value < low)
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value = low;
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else if (value > high)
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value = high;
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return value;
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}
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static inline int squarei(int a) { return a * a; }
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static inline int absi(int a) { return (a < 0) ? -a : a; }
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template <typename F> inline F lerp(F a, F b, F s) { return a + (b - a) * s; }
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